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\ Aug. 30, 1955 H. LINDE u 2,716,505

EECEPTACLE 0E SHEET METAL Filed Jan, 25, 1952 Eil?.

United States Patent Othce 2,716,505 Patented Aug. 30, 1955 RECEPTACLE FSHEET METAL Hilding Linde, Kalmar, Sweden Application January 23, 1952,Serial No. 267,761 Claims priority, application Sweden January 27, 19512 Claims. (Cl. 22069) This invention relates to a receptacle 4of sheetmetal, especially a dustbin, comprising a jacket part, a bottom part anda supporting bottom ring welded together.

One object of the invention is to unite the three parts in such a waythat bending strain is prevented in the joint by the load.

Another object is to provide a completely smooth surface at the insideof the joint between the jacket part and the bottom part whereby thereceptacle can easily be cleaned and disinfectcd.

A further object is to combine the three parts in such a way that theydo not form such pockets which remain uncovered at the galvanization andin which the acid in which the receptacle is to be dipped before thegalvanization may remain and corrode the metal. j

A still further object is to provide a very simple joint for uniting thethree parts which is easy to make and which makes it possible to use athin metal sheet without constituting a weekened zone.

With these and other objects in view the invention is hereinafterdescribed and illustrated by way of example in the accompanying drawingin which:

Fig. 1 is a vertical section through one half of a dustbin according toa preferred form of the invention.

Fig. 2 is a similar vertical section through a slightly modified form.

'I'he jacket part 1 is made of sheet iron and may have a cylindrical,conical or other form. In a section perpendicularly to the axis thejacket may form a circle, a square or other form. 'Ihe jacket rests onthe bottom part 2 in such a way that it forms with the peripheral andupwardly bent portion of the bottom part a butt joint. The both partsare so dimensioned that a continuous inner surface is obtained along thejoint. The bottom part extends in a vertical section along a circlehaving the centre M and the radius r. The thickness of the sheet ironusually varies between 0.5 and 2 mm. but is shown in the drawingenlarged for the sake of clearness. Within the rounded portion thebottom is substantially plane. A bottom ring 3 is made of band ironhaving a thickness exceeding that of the jacket part. The band iron isbent in a separate operation to a ring and has the ends welded together.The position of the bottom part 2 is adjusted in such a Way that theupperv edge thereof extends slightly above the bottom ring 3 and usually1-3 mm. or a distance corresponding to half the thickness of the bottomring. The centre M is according to Fig. 1 located at the same level asthe upper surface of the bottom ring. According to Fig. 2 the centre islocated at a short distance above the bottom ring, and the bottom partrests with its upper surface against the bottom ring substantially onlyin points located alonf.1 a circle. The space beween the bottom ring andthe bottom part is thereby enlarged in order to facilitate thepenetration of the zinc between the both surfaces facing each other anda complete galvanization of said surfaces.

The receptacle may be manufactured in the following j and it can,

manner. When the bottom part has been formed by a pressing operation andwhen the jacket part has been welded together along a vertical buttjoint the both edges of the parts to be united are ground on a surfacegrinding machine in order to obtain plane abutting surfaces in the buttjoint. The jacket part is hereafter placed on the bottom part, and thecorrect position of the edges to be joined is performed by means of animplement, such as a welding jig, so that the inner surface becomessmooth. The both parts are then welded together on their outer surfacesso that a continuous and all around extending welding seam is obtained.The bottom ring is now placed in correct position in the bottom part,whereafter the bottom ring is fastened by welding either continuously ordiscontinuously along the welding seam between the jacket part and thebottom part. It is also possible to unite the three parts in a singlewelding operation. The shelf formed between the upper surface of thebottom ring and the side wall of the bin may be filled out by thewelding material, whereby a rigid connection between the three parts issecured. The receptacle may be galvanized by dipping in a molten zincbath whereby the joint is completely covered by a zinc layer.

By the continuously rounded bottom the risk of rupture is precluded, andas all the inner surface is completely smooth without any unevenness inthe joint and without any sharp corner the receptacle can very easily becleaned, therefore, also be used in such cases where great hygienicdemands are made, such as upon milk receptacles.

I claim:

l. In a method of manufacturing a receptacle of sheet metal composed ofa jacket part, a bottom part and a supporting bottom ring, the stepscomprising pressing the peripheral portion of the bottom part upwardlyso as to form an extension of the jacket part in a butt joint betweensaid parts and a smooth inner surface at the joint, grinding theabutting edges of said parts to a plane form, uniting the both parts bymeans of a welding seam along the outside of the butt joint, placingthereafter the bottom ring around the bottom part in such a positionthat its upper edge is located immediately below the level of the buttjoint, and welding the upper edge of the bottom ring and said weldingseam together. part only between the end surfaces corresponding to the2. In a galvanized receptacle of sheet metal, a jacket part, a bottompart having its peripheral portion bent upwardly so as to form a smoothbutt joint with said jacket square sectlons or said parts, a supportingbottom ring of a constant thickness bearing only with its upper andinner edge against said bottom part and positioned with its upper endsurface at a distance below the edge of the bottom part, said distancebeing less than the thickness of said bottom ring, and a single weldingseam provided in the angle between the upper end surface of the bottomring and the outer side surfaces of the bottom part and the jacket partso as to unite the side surfaces of both of said parts with the upperend surface of the bottom ring.

References Cited in the tile of this patent UNITED STATES PATENTS984,921 Donnell Feb. 2l, 1911 1,059,423 Zwermann Apr. 22, 1913 1,441,304Slocomb Ian. 9, 1923 1,934,356 Kice Nov. 7, 1933 2,071,621 GettelmanFeb. 23, 1937 2,233,455 Larson Mar. 4, 1941 2,287,869 Ehrman June 30,1942 2,326,137 Gettelman Aug. 10, 1943

